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    <title>class list</title>
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<body>
    <h2>你要买什么课程?</h2>
    <p title='请您选择购买的课程'>
        本课程是web全栈课程,期待你的购买!
    </p>
    <ul id='classList'>
        <li class='item'>JavaScript</li>
        <li class='item'>css</li>
        <li>DOM</li>

    </ul>

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